exactly addictedtonitro something that would absorb more of an impact. you are right that rpm bumper did its job. i already had upgraded all the bearing carriers etc. that bumper transferd all the force to the chassis. I wonder if i were to add a thin piece of metal under the chassis from the bumper to end of chassis if that would make it more durable. becuse now it seems the chassis is going to take most of the impact of any hit.